考虑粗糙峰弹塑性变形和润滑油性质的有限长线接触副混合润滑模型

A Mixed EHL Model of Finite-Length Line Contact Considering Asperity Elasto-Plastic Deformation and the Lubricant Properties

基于载荷分享机制和考虑粗糙表面接触变形的统计学模型,建立了耦合粗糙峰接触弹塑性变形与边界膜摩擦化学效应的有限长线接触热弹流混合润滑模型,通过与无限长线接触混合润滑模型的分析结果、有限长线接触光弹流润滑实验以及双圆盘实验结果的对比,验证了所建模型的可靠性,并探讨了表面粗糙度和润滑油性质对接触副润滑性能的影响.结果表明,降低表面粗糙度可以改善润滑状态,从而提高有限长线接触副的极限承载力.

The thermal mixed lubrication model of finite-length line contacts is established,which takes account of the elasto-plastic deformation of the asperities and boundary-film tribo-chemistry properties.The model is verified by comparing the infinite-length theoretical model,the elastohydrodynamic lubrication(EHL)test rig and double-disk experimental data.Then the effect of surface roughness and the lubricant properties on the lubrication and friction are preliminarily discussed.The results show that reducing the surfuce roughness can effectively improve the scuffing resistance under the current operating conditions.